| Election Name: | 2020 Ohio Senate election |
| Previous Election: | 2018 Ohio Senate election |
| President of the Ohio Senate | |
| Seats For Election: | 16 seats from even-numbered districts in the Ohio Senate |
| Seats Before2: | 9 |
| Seats Before1: | 24 |
| Seats After2: | 8 |
| Seats After1: | 25 |
| Seat Change2: | 1 |
| Seat Change1: | 1 |
| Next Election: | 2022 Ohio Senate election |
| Percentage1: | 61.47% |
| Popular Vote2: | 1,097,400 |
| Popular Vote1: | 1,754,433 |
| Percentage2: | 38.45% |
| Party2: | Democratic Party (United States) |
| Type: | legislative |
| Party1: | Republican Party (United States) |
| Next Year: | 2022 |
| Previous Year: | 2018 |
| Leaders Seat2: | District 25 |
| Majority Seats: | 17 |
| Leader1: | Larry Obhof |
| Leader Since1: | January 3, 2019 |
| Country: | Ohio |
| Before Party: | Republican Party (United States) |
| Before Election: | Larry Obhof |
| After Party: | Republican Party (United States) |
| After Election: | Matt Huffman |
| Ongoing: | no |
| Leaders Seat1: | District 22 |
| Leader2: | Kenny Yuko |
| Leader Since2: | April 26, 2017 |
| Map Size: | 250px |
| Swing1: | 5.14% |
| Swing2: | 5.07% |
| Turnout: | 74.0% (2.7pp) |
The 2020 Ohio Senate election was held on November 3, 2020, with the primary election held on April 28, 2020. Ohio voters elected state senators in the 16 even-numbered Ohio Senate districts. State senators elected in 2020 will be eligible to serve a four-year term beginning January 2021 and ending December 2024. These elections coincided with elections for U.S. President and the Ohio House.
Although Democrats had hoped to break the Republican supermajority in the chamber (which would have required them to pick up three seats), they ended up losing one, further consolidating Republican control.
| Party | Candidates | Votes | Seats Won | ||||||
|---|---|---|---|---|---|---|---|---|---|
| No. | % | +/– | No. | +/– | % | ||||
| Republican Party | 16 | 1,754,433 | 61.48 | 5.14 | 15 | 1 | 93.75 | ||
| Democratic Party | 16 | 1,097,400 | 38.45 | 5.07 | 1 | 1 | 6.25 | ||
| Independent | 2 | 1,950 | 0.07 | 0.07 | 0 | 0 | 0.00 | ||
| Total | 2,853,783 | 100.00 | 16 | 100.00 | |||||
Seats where the margin of victory was under 10%:
|}
79.3